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Transcription:

Viscosity of Ternary CaO-SiO2-Mx (F, O)y and CaO-Al2O3-Fe2O3 Melts Toshikazu YASUKOUCHI, Kunihiko NAKASHIMA and Katsumi MORI Synopsis : Effects of additives (Li2O, Na2O, K2O, MgO, BaO, Al2O3, Fe2O3, TiO2, NaF, CaF2) on viscosities of CaO-SiO2 (CaO/SiO2= 1) melts have been studied by a crucible-rotating method. Viscosities of CaO-Al2O3-Fe2O3 melts also have been measured. The addition of Al2O3 lead to increase the viscosities of CaO-SiO2 (CaO/SiO2= 1) melts, and the viscosities of CaO-SiO2 (CaO/SiO2= 1) melts decreased with the addition of the other elements. The viscosities of CaO-Al2O3-Fe2O3 melts of constant CaO content decreased with the substitution of Fe2O3 for Al2O3. lida's equation for viscosity reproduced the experimental viscosity data for CaO-SiO2 (CaO/SiO2= 1) melts except for high Al2O3 content (40 mass% Al2O3) slag. Key words : viscosity; additive; CaO-SiO2 (CaO/SiO2= 1) melts; CaO-Al2O3-Fe2O3 melts.

Table 1. Initial and final compositions, and temperature range and viscosity for CaO-SiO2 based slags. Fig. 1. Apparatus for viscosity measurement and the experimental conditions. Table 2. Initial and final compositions, and temperature range and viscosity for CaO-Al2O3-Fe2O3 slags.

Table 3. Chemical compositions of SRM2 and of slags used in this study. Fig. 3. Temperature dependence of viscosities of the Li2O CaO-SiO2 slags. Fig. 2. Temperature dependence of viscosities of SRM2 and of the slags used in this study. Fig. 4. Changes in viscosities of CaO-SiO2-R2O slags with R2O content at 1823K. Fig. 5. Changes in viscosities of CaO-SiO2-RO slags with RU content at 1823K.

Fig. 6. Changes in viscosities of CaO-SiO2-RxOy slags with RxOy content at 1823K. Fig. 8. Relation between viscosities and ionic radii of cations of the additives in CaO-SiO2 based slags at 1823K. ( ; 50 mass% CaO-50 mass% SiO2 based slag). Fig. 7. Changes in viscosities of CaO-SiO2-RxFy slags with RxFy content at 1823K.

Fig. 9. Temperature dependence of viscosities of the 30CaO-(70- ~ )Al2O3- ~ Fe2O3 slags. Fig. 10. Changes in viscosities of CaO-Al2O3-Fe2O3 slags with Fe2O3 content at 1773K. Fig. 11. Changes in viscosities of CaO-Al2O3-Fe2O3 slags, and of RO-Fe2O3 slags with RO content at 1773K.

Fig. 12. Comparison of measured and calculated value of the viscosities for CaO Si02 based slags at 1823K.

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